A researcher conducted a study of high achieving students at KU and found that, when faced with high stress levels, one group tended to get sick whereas the other group tended not to get sick.

Stress is dependent upon one person's mental ability.

Explanation:

A researcher conducted a study where he noticed some student is highly stressed during exams and some students are not that stressed during exams. This happens due to the mental ability of a person. If a person is able to keep himself or herself cool during exams , he or she will not face the stress . On the other hand if the person is unable to keep himself and herself cool , he or she will not be stressed during exams.

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Explanation:

the answer would be  

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answer; hepatitis a& b can be passed through breast milk; (true);